After passing through the iris, the light rays pass thru the eye’s natural crystalline lens. This clear, flexible structure works like the lens in a camera to focus the light rays properly. Sometimes and especially as the eye ages, this doesn’t work perfectly.  In many of these situations, the vision can be sharpened through the use of eye glasses.

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In a normal eye, the light rays come to a sharp focusing point on the retina. The retina functions much like the film in a camera. It is responsible for capturing all of the light rays, processing them into light impulses through millions of tiny nerve endings, and then sending these light impulses through over a million nerve fibers to the optic nerve.

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In summary, the cornea is the clear, transparent front covering which admits light and begins the refractive process. It also keeps foreign particles from entering the eye.

 

The pupil is an adjustable opening that controls the intensity of light permitted to strike the lens.

The retina receives the image that the cornea focuses through the eye’s internal lens and transforms this image into electrical impulses that are carried by the optic nerve to the brain.

 

Cataracts

 

Cataracts are cloudy blemishes that form in the lens of a person’s eye, and they are most commonly seen in people over the age of sixty.